Fix assert_known

reid/src/mir/typecheck.rs

@@ -762,22 +762,26 @@ impl TypeKind {
         refs: &TypeRefs,
         state: &TypecheckPassState,
     ) -> Result<TypeKind, ErrorKind> {
+        self.is_known(refs, state).map(|_| self.clone())
+    }
+
+    fn is_known(&self, refs: &TypeRefs, state: &TypecheckPassState) -> Result<(), ErrorKind> {
         match &self {
-            TypeKind::Array(type_kind, _) => type_kind.as_ref().assert_known(refs, state),
+            TypeKind::Array(type_kind, _) => type_kind.as_ref().is_known(refs, state),
             TypeKind::CustomType(custom_type_key) => state
                 .scope
                 .types
                 .get(custom_type_key)
-                .map(|_| self.clone())
+                .map(|_| ())
                 .ok_or(ErrorKind::NoSuchType(
                     custom_type_key.0.clone(),
                     state.module_id.unwrap(),
                 )),
-            TypeKind::Borrow(type_kind, _) => type_kind.assert_known(refs, state),
-            TypeKind::UserPtr(type_kind) => type_kind.assert_known(refs, state),
-            TypeKind::CodegenPtr(type_kind) => type_kind.assert_known(refs, state),
+            TypeKind::Borrow(type_kind, _) => type_kind.is_known(refs, state),
+            TypeKind::UserPtr(type_kind) => type_kind.is_known(refs, state),
+            TypeKind::CodegenPtr(type_kind) => type_kind.is_known(refs, state),
             TypeKind::Vague(vague_type) => Err(ErrorKind::TypeIsVague(*vague_type)),
-            _ => Ok(self.clone()),
+            _ => Ok(()),
         }
     }
 }

reid_src/test.reid

@@ -1,7 +1,12 @@
-struct SDL_Thing {}
+fn vec_sub(l: [f32; 3], r: [f32; 3]) -> [f32; 3] {
+    return [l[0]-r[0], l[1]-r[1], l[2]-r[2]];
+}
 
-extern fn SDL_malloc(size: u64) -> *SDL_Thing;
+fn foo(x: f32) {
+    let a = [x, x, 0.0];
+    let b = [x, x, x]; // works
+    // let b = [x * 0.5, x * 0.5, x]; // does not work
+    vec_sub(a, b);
+}
 
-fn main() {
-    let pixels = SDL_malloc(4 * 320 * 240);
-}
+fn main() {}